WSBR培养好氧颗粒污泥的试验研究

Experimental research on aerobic granular sludge cultivation in WSBR

为使活性污泥更好更快地形成好氧颗粒污泥,利用搅拌序批式活性污泥(WSBR)与传统序批式活性污泥(SBR)反应器,基于聚丙烯酰胺(PAM)的添加,研究了二次流场对好氧污泥颗粒化的影响.结果表明:WSBR中好氧颗粒污泥形成快于SBR,其粒径主要分布在0.9～1.5mm之间,污泥指数(SVI)稳定在50mL/g左右,比重增加了0.050 9,挥发性悬浮固体(VSS)(质量分数)达到81.32%,耗氧速率(SOUR)达1.387mg/(min.g)(以O2计);而SBR中形成的颗粒污泥粒径主要分布在1.5～2.0mm之间,SVI在70mL/g左右,比重只增加0.039 6,VSS(质量分数)为72.31%,SOUR只有1.063mg/(min.g)(以O2计);且SBR的颗粒污泥污泥含水率比WSBR中的颗粒污泥高2.8%.在微生物结构、高浓度的废水处理等方面WSBR优于SBR反应器,表明在合理的二次流条件下,利用PAM混凝沉降原理可以较快地形成良好的好氧颗粒污泥.并提出了二次流混凝好氧颗粒污泥颗粒化物理模型.

In order to make active granules form aerobic granular sludge better and faster, based on the addition of polyacrylamide, we focused on the granulation effects of aerobic granular sludge of the secondary flow, using WSBR and the traditional SBR. The results indicate that aerobic active sludge is formed faster in WSBR than in the SBR. Moreover, the diameters of most aerobic active sludge found in WSBR are within the range of 0. 9-1.5 ram, SVI is around a stable value of 50 mL/g, the specific gravity of granular sludge is increased by 0. 050 9, VSS is increased to 81.32%, SOUR reaches to 1. 387 mg/（min · g）. However, the diameters of most aerobic active sludge found in SBR are within the range of 1.5-2.0 mm, SVI is around a stable value of 70 mL/g, the specific gravity of granular sludge is only increased by 0. 039 6, VSS is increased to 72.31%, SOUR reaches to 1. 063 mg/（min · g）, and the percentage ofcontained water of sludge in SBR is 2.8% higher than that in traditional WSBR. The WSBR is significantly better than the SBR in the aspects of high concentrations of wastewater treatment and Microbial structure, which indicates that with reasonable secondary flow field, good aero- bic granular sludge could be rapidly formed by applying PAM coagulation sedimentation theory and the granulation physical model of secondary flow coagulation is proposed.